Decapitated Peas and Diffusible Gibberellins

Gibberellins and Light Inhibition of Stem Growth in Peas.

Light-induced inhibition of stem growth is a common phenomenon in plants. Particularly well investigated is the case of peas, Pisum sativum, mainly thanks to the work of Lockhart. Lockhart showed that growth of Alaska peas, a tall variety, was retarded when plants were transferred from darkness to low-intensity light but that, after a period of inhibition, the plants resumed growth at a rate eq...

Gibberellins

What are they? The gibberellins make up a family of small organic compounds derived from a common 20-carbon precursor. They regulate growth and development in plants and their chemical structure superficially resembles that of steroid hormones. So far, more than 100 gibberellins have been identified. Fortunately, any one plant species produces only a few of the known gibberellins. Furthermore, ...

Fetally Decapitated Pigs

The effect of decapitation on semitendinosus muscle growth and development was studied in the fetal pig. Pig fetuses were decapitated at 45 d of gestation and histochemical and biochemical analyses conducted at 110 d of gestation. Decapitation prevented or delayed the conversion of secondary fibers from Type II to Type I histochemistry as is characteristic of the normal semitendinosus. Morpholo...

On the Determination of Diffusible and Non- Diffusible Serum Calcium

On the Determination of Diffusible and Non- Diffusible Serum Calcium